When I closed and reopened the editor, it reported a bunch of errors. Upon inspection, it was found that it had added the prefix “PLAYHOLDER CLASS” in front of my reference to the custom blueprint class. At this point, no matter what I do, I cannot recover unless I manually replace these erroneous classes back with normal blueprint classes. But when I replace it and close the editor and reopen it, the editor will have the same problem again.
I would greatly appreciate it if someone could tell me how to solve this problem.
When closing the editor after fix all the “PLACEHOLDER-CLASS” bug, an error occurs as follows:
Blockquote
[2025.06.23-08.36.19:418][ 51]LogWindows: Error: === Critical error: ===
[2025.06.23-08.36.19:418][ 51]LogWindows: Error:
[2025.06.23-08.36.19:418][ 51]LogWindows: Error: Fatal error!
[2025.06.23-08.36.19:418][ 51]LogWindows: Error:
[2025.06.23-08.36.19:418][ 51]LogWindows: Error: Unhandled Exception: EXCEPTION_ACCESS_VIOLATION reading address 0x00000bf800016ca6
[2025.06.23-08.36.19:418][ 51]LogWindows: Error:
[2025.06.23-08.36.19:418][ 51]LogWindows: Error: [Callstack] 0x00007ff81b899d33 UnrealEditor-CoreUObject.dll!UnknownFunction
[2025.06.23-08.36.19:418][ 51]LogWindows: Error: [Callstack] 0x00007ff81ba08c9b UnrealEditor-CoreUObject.dll!UnknownFunction
[2025.06.23-08.36.19:418][ 51]LogWindows: Error: [Callstack] 0x00007ff81ba065a2 UnrealEditor-CoreUObject.dll!UnknownFunction
[2025.06.23-08.36.19:418][ 51]LogWindows: Error: [Callstack] 0x00007ff81b9d967e UnrealEditor-CoreUObject.dll!UnknownFunction
[2025.06.23-08.36.19:418][ 51]LogWindows: Error: [Callstack] 0x00007ff81b9dc086 UnrealEditor-CoreUObject.dll!UnknownFunction
[2025.06.23-08.36.19:418][ 51]LogWindows: Error: [Callstack] 0x00007ff81b91448c UnrealEditor-CoreUObject.dll!UnknownFunction
[2025.06.23-08.36.19:418][ 51]LogWindows: Error: [Callstack] 0x00007ff81b898d44 UnrealEditor-CoreUObject.dll!UnknownFunction
[2025.06.23-08.36.19:419][ 51]LogWindows: Error: [Callstack] 0x00007ff81b8c186c UnrealEditor-CoreUObject.dll!UnknownFunction
[2025.06.23-08.36.19:419][ 51]LogWindows: Error: [Callstack] 0x00007ff81ba166c4 UnrealEditor-CoreUObject.dll!UnknownFunction
[2025.06.23-08.36.19:419][ 51]LogWindows: Error: [Callstack] 0x00007ff81b64b117 UnrealEditor-CoreUObject.dll!UnknownFunction
[2025.06.23-08.36.19:419][ 51]LogWindows: Error: [Callstack] 0x00007ff7d38ed6d1 UnrealEditor.exe!UnknownFunction
[2025.06.23-08.36.19:419][ 51]LogWindows: Error: [Callstack] 0x00007ff7d38ece12 UnrealEditor.exe!UnknownFunction
[2025.06.23-08.36.19:419][ 51]LogWindows: Error: [Callstack] 0x00007ff7d38f36ea UnrealEditor.exe!UnknownFunction
[2025.06.23-08.36.19:419][ 51]LogWindows: Error: [Callstack] 0x00007ff7d38f583b UnrealEditor.exe!UnknownFunction
[2025.06.23-08.36.19:419][ 51]LogWindows: Error: [Callstack] 0x00007ff7d38f589a UnrealEditor.exe!UnknownFunction
[2025.06.23-08.36.19:419][ 51]LogWindows: Error: [Callstack] 0x00007ff7d38f9114 UnrealEditor.exe!UnknownFunction
[2025.06.23-08.36.19:419][ 51]LogWindows: Error: [Callstack] 0x00007ff7d390bd04 UnrealEditor.exe!UnknownFunction
[2025.06.23-08.36.19:419][ 51]LogWindows: Error: [Callstack] 0x00007ff7d390f0ba UnrealEditor.exe!UnknownFunction
[2025.06.23-08.36.19:419][ 51]LogWindows: Error: [Callstack] 0x00007ff920e87344 KERNEL32.DLL!UnknownFunction
[2025.06.23-08.36.19:419][ 51]LogWindows: Error:
[2025.06.23-08.36.19:467][ 51]LogExit: Executing StaticShutdownAfterError
[2025.06.23-08.36.19:469][ 51]LogWindows: FPlatformMisc::RequestExit(1, LaunchWindowsStartup.ExceptionHandler)
[2025.06.23-08.36.19:469][ 51]LogWindows: FPlatformMisc::RequestExitWithStatus(1, 3, LaunchWindowsStartup.ExceptionHandler)
[2025.06.23-08.36.19:469][ 51]LogCore: Engine exit requested (reason: Win RequestExit; note: exit was already requested)
When closing the editor without fixed the class, an error occurs as follows:
Blockquote
[2025.06.23-08.46.27:858][ 3]LogWindows: Error: === Critical error: ===
[2025.06.23-08.46.27:858][ 3]LogWindows: Error:
[2025.06.23-08.46.27:858][ 3]LogWindows: Error: Assertion failed: false [File:D:\build++UE5\Sync\Engine\Source\Runtime\CoreUObject\Private\UObject\LinkerPlaceholderBase.cpp] [Line: 709]
[2025.06.23-08.46.27:858][ 3]LogWindows: Error: Unhandled property type: StructProperty
[2025.06.23-08.46.27:858][ 3]LogWindows: Error:
[2025.06.23-08.46.27:858][ 3]LogWindows: Error:
[2025.06.23-08.46.27:858][ 3]LogWindows: Error: [Callstack] 0x00007ff841929405 UnrealEditor-CoreUObject.dll!UnknownFunction
[2025.06.23-08.46.27:858][ 3]LogWindows: Error: [Callstack] 0x00007ff8419265a2 UnrealEditor-CoreUObject.dll!UnknownFunction
[2025.06.23-08.46.27:858][ 3]LogWindows: Error: [Callstack] 0x00007ff8418f967e UnrealEditor-CoreUObject.dll!UnknownFunction
[2025.06.23-08.46.27:858][ 3]LogWindows: Error: [Callstack] 0x00007ff8418fc086 UnrealEditor-CoreUObject.dll!UnknownFunction
[2025.06.23-08.46.27:858][ 3]LogWindows: Error: [Callstack] 0x00007ff84183448c UnrealEditor-CoreUObject.dll!UnknownFunction
[2025.06.23-08.46.27:858][ 3]LogWindows: Error: [Callstack] 0x00007ff8417b8d44 UnrealEditor-CoreUObject.dll!UnknownFunction
[2025.06.23-08.46.27:858][ 3]LogWindows: Error: [Callstack] 0x00007ff8417e186c UnrealEditor-CoreUObject.dll!UnknownFunction
[2025.06.23-08.46.27:858][ 3]LogWindows: Error: [Callstack] 0x00007ff8419366c4 UnrealEditor-CoreUObject.dll!UnknownFunction
[2025.06.23-08.46.27:858][ 3]LogWindows: Error: [Callstack] 0x00007ff84156b117 UnrealEditor-CoreUObject.dll!UnknownFunction
[2025.06.23-08.46.27:858][ 3]LogWindows: Error: [Callstack] 0x00007ff7d38ed6d1 UnrealEditor.exe!UnknownFunction
[2025.06.23-08.46.27:858][ 3]LogWindows: Error: [Callstack] 0x00007ff7d38ece12 UnrealEditor.exe!UnknownFunction
[2025.06.23-08.46.27:858][ 3]LogWindows: Error: [Callstack] 0x00007ff7d38f36ea UnrealEditor.exe!UnknownFunction
[2025.06.23-08.46.27:858][ 3]LogWindows: Error: [Callstack] 0x00007ff7d38f583b UnrealEditor.exe!UnknownFunction
[2025.06.23-08.46.27:858][ 3]LogWindows: Error: [Callstack] 0x00007ff7d38f589a UnrealEditor.exe!UnknownFunction
[2025.06.23-08.46.27:858][ 3]LogWindows: Error: [Callstack] 0x00007ff7d38f9114 UnrealEditor.exe!UnknownFunction
[2025.06.23-08.46.27:858][ 3]LogWindows: Error: [Callstack] 0x00007ff7d390bd04 UnrealEditor.exe!UnknownFunction
[2025.06.23-08.46.27:858][ 3]LogWindows: Error: [Callstack] 0x00007ff7d390f0ba UnrealEditor.exe!UnknownFunction
[2025.06.23-08.46.27:858][ 3]LogWindows: Error: [Callstack] 0x00007ff920e87344 KERNEL32.DLL!UnknownFunction
[2025.06.23-08.46.27:858][ 3]LogWindows: Error:
[2025.06.23-08.46.27:893][ 3]LogExit: Executing StaticShutdownAfterError
[2025.06.23-08.46.27:894][ 3]LogWindows: FPlatformMisc::RequestExit(1, LaunchWindowsStartup.ExceptionHandler)
[2025.06.23-08.46.27:894][ 3]LogWindows: FPlatformMisc::RequestExitWithStatus(1, 3, LaunchWindowsStartup.ExceptionHandler)
[2025.06.23-08.46.27:894][ 3]LogCore: Engine exit requested (reason: Win RequestExit; note: exit was already requested)